<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>阴影</title>
    <link rel="stylesheet" href="../../css/bootstrap.min.css">
    <link rel="stylesheet" href="../../bootstrap-icons-1.13.1/bootstrap-icons.min.css">
</head>
<body>
    <div class="container" style="width:500px;height: 500px;">
        <div class="shadow w-50 h-50 rounded-pill bg-danger"></div>
    </div>
</body>
</html>